US3593204A — High frequency voltage controlled oscillator

Claim 1

Independent Claim 187 words

A voltage tunable oscillator circuit comprising in combination: a signal translation device having an input and an output terminal and including means for rendering said signal translation device operable as an amplifier; a positive feedback circuit coupled between said input and output terminals, having a loop gain sufficient for establishing an oscillatory mode of operation, and including a bridge resonator circuit comprising a first and a second voltage variable capacitor coupled in adjacent branches of said bridge resonator circuit, and a first and a second inductance coupled respectively to one end of said first and second voltage variable capacitor forming opposite adjacent legs of said bridge resonator circuit thereby and having a common connection therebetween, said first and second voltage variable capacitors and said first and second inductances forming a series resonant circuit between said input and output terminals; and bias voltage circuit means coupled to said first and second voltage variable capacitor for applying a predetermined voltage thereto for selectively setting the capacitance values thereto for operating said resonator circuit at a predetermined frequency and thereby establishing the output frequency of said voltage tunable oscillator circuit.

Claim 2

Dependent Claim 187 words

A voltage tunable oscillator circuit comprising in combination: a signal translation device having an input and an output terminal and including means for rendering said signal translation device operable as an amplifier; a positive feedback circuit coupled between said input and output terminals, having a loop gain sufficient for establishing an oscillatory mode of operation, and including a bridge resonator circuit comprising a first and a second voltage variable capacitor coupled in adjacent branches of said bridge resonator circuit, and a first and a second inductance coupled respectively to one end of said first and second voltage variable capacitor forming opposite adjacent legs of said bridge resonator circuit thereby and having a common connection therebetween, said first and second voltage variable capacitors and said first and second inductances forming a series resonant circuit between said input and output terminals; and bias voltage circuit means coupled to said first and second voltage variable capacitor for applying a predetermined voltage thereto for selectively setting the capacitance values thereto for operating said resonator circuit at a predetermined frequency and thereby establishing the output frequency of said voltage tunable oscillator circuit.

Claim 3

Dependent Claim 61 words

The invention as defined by claim 1 wherein said signal translation device comprises a first transistor having a base, an emitter and a collector and wherein said transistor is operated in a common base circuit configuration including circuit means for coupling said base to a point of reference potential, and said input and output terminals respectively comprise said emitter and collector.

Claim 4

Dependent Claim 26 words

The invention ad defined by claim 2 wherein said feedback circuit additionally includes band pass filter means coupled between said collector and said bridge resonator circuit.

Claim 5

Dependent Claim 31 words

The invention as defined by claim 2 wherein said posItive feedback circuit additionally includes circuit means for coupling said voltage second voltage variable capacitor to the emitter of said first transistor.

Claim 6

Dependent Claim 46 words

The invention as defined by claim 1 wherein said first and second voltage variable capacitors each comprise a semiconductor varactor diode and additionally including circuit means coupled to said first and second varactor diode for applying a modulation signal thereto for varying the capacitance values thereof.

Claim 7

Dependent Claim 30 words

The invention as defined by claim 5 wherein said last mentioned circuit means comprises a second signal translation device coupled to the common connection of said first and second inductance.

Claim 8

Dependent Claim 52 words

The invention as defined by claim 6 wherein said signal translation device comprises a transistor having a base, an emitter, and a collector and including circuit means for coupling said modulation signal to said base and circuit means for coupling said emitter to the common connection between said first and second inductance.

Claim 9

Dependent Claim 44 words

The invention as defined by claim 2 wherein said feedback circuit additionally includes an emitter follower circuit operably coupled between said first transistor and said series resonant circuit, said emitter follower circuit including a second transistor having a base, an emitter, and a collector.

Claim 10

Dependent Claim 33 words

The invention as defined by claim 8 including a third transistor coupled to said bridge resonator circuit for applying a modulation signal therethrough for varying the capacitance values of said voltage variable capacitors.

Claim 11

Dependent Claim 23 words

The invention as defined by claim 9 wherein said third transistor is coupled to the common connection of said first and second inductance.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-07-12	1975-01-11	1975-07-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-07-12	1979-01-11	1979-07-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-07-12	1983-01-11	1983-07-13	$7700.00	Window Closed / Lapsed

High frequency voltage controlled oscillator

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